Scale bearing



SCALE BEARING Filed July 23, 1930 2 Sheets-Sheet l Aug-I 1934. w. N.GILBERT 1,969,363

SCALE BEARING Filed July 23, 1930 2 Sheets-Sheet 2 Patented Aug. 7, 1934UNITED "STATES PATENT QFFlCisI SCALE BEARING William N. Gilbert, HudsonHeights, N. J., as

signer, by mesne assignments, to International Business MachinesCorporation, New York, N. Y., a corporation of New York Application July23, 1930, Serial No. 470,053 10 Claims. (01. 308-2 This case relates tothe pivot constructions of weighing scales.

The object of the invention is to provide novel means for securingpivots in their scale elements.

6 Another object isto .provide novel means for bearing block 22 restingon the pivot 13.

finely adjusting pivots in their bearings.

Various other objects and advantages of my invention will be obviousfrom the following particular description of one form of mechanismembodying the invention or from an inspection of the accompanyingdrawing; and the invention also constitutes certain new and novelfeatures of construction and combination of parts herein-' after setforth and claimed.

'In the drawings:

Fig. 1 is a top view of the bifurcated end of the lever with thebearings in place.

Fig. 2 is a side view of Fig. 1', partly in section. Fig. 3 is a sectionalong line 3-3 of Fig. 2. Fig. 4 is a detail of anadjustment plate usedfor adjusting the angle of the knife edge.

' Fig. 5 is'a detail of the projecting end of the knife edge pivot. i

Fig. 6 is a side view of a lever end of a different form than in Fig; 1with the pivot assemblies in place. 1

Fig. '7 is a section on line 7-7 of Fig. 8 and Fig. 8 is a detail of thepivot construction with the parts in section. a 'f Referring first toFigs. 6 to 8, the terminal portion 10 of the scale member 11 is formedwith a round bore to receive the round end 12 of a pivot element 13. Theroundend 12 is provided with a V-shaped peripheral groove 14 adapted toreceive steel balls 15. Threaded into a bore .16 of the portion 10 is ascrew 17 having a conically pointed end 18 for wedging the balls apartinto contact with the walls of bore '16 (see Fig. 7) and at the sametime wedging the balls down into the groove 14 of the pivot end 12. Inthis manher, the pivot 13 is fixed against both rotation and endwisemovement relative to the portion 10.

The outer flat face of the round portion 12 of the pivot is providedwith a notch 20 for receiving a spanner tool or the like to rotate andthereby adjust the pivot. After adjustment, the screw 17 is moved downinto the bore to clamp the pivot against movement. Athrust plate-21 isprovided to resist endwise movement of the V-groove In Figs. 1 to 5 isshown th bifurcated end 25 of a lever 26. Pivot 27 is locked at each endby the means described in Figs 6 to 8. Instead of using a screw such as17, however, the modification in Figs. 1 to-5 is-provided with a headedscrew 28 between which and the edge of the lever'furca tion is held aspring Washer 29 for resistingmovement of the screw after it has beenset and a U- shaped thrust member 30 for resisting endwise movement ofthe V-groove bearingblock 31.

The knife edge pivot 32 is held at one end by the same means as thepivot 27. At the other end, the lever furcation carries a Ushaped member33, the inner leg of which engages the topof the pivot 32 and resistsend thrust of the bearing member 31 (see Fig. 3). 34 is provided with anotch 35 for receiving the projection'36 (see Fig. 5) of the pivot end.Passing through the top of the U-shaped member 33 is a pair of spacedscrews 37 threaded into the lever furcatiom The member 33 is clamped tothelever furcation by these screws, downward movement of the memberbeing limited by engagement of both legs with the pivot 32. When it isdesired to rotatively adjust the pivot 32 the ball locking means for thepivot on the right'side of the pivot (as viewed inFig. 8) is releasedand the screws 3''! moved relatively to tilt the member 33 and throughengagement of slot 35 thereof with projection 36 rotate the pivot 32.after the ball lock is again tightened on the right handend of the pivotthereby preventing further adjustment thereof.

While there has been shown and described and pointed out thefundamentalnovel features of the invention as applied to a single modification, itwillbe understood that variousfomissions and substitutions and changesin the form and details of the device illustratedand in; its operationmaybe madeby those skilled in theart without There- The outer legdeparting from the spirit of the invention. It

is the intention therefore to be limited only as indicated by the scopeof the following claims.

11 A device comprising a pivot having a circumferential peripheralopengroove, a member having a hole for rotatively adjustably receivingthe pivot, said member also having a bore extending angularly to thehole and opening into the hole, a pair of balls partly locatedin'thebore and partly seated in the groove, and a wedge memberadjustablycarrie'd' in said bore and loo 7 adapted to simultaneouslywedge the balls apart 2. A device comprising a pivot, a holding memberrotatably supporting the pivot, an adjustable element separately carriedand secured to the holding member and engaging the pivot to adjust itrelative to the holding member, means apart from said element forlocking the pivot to the holding member after adjustment, said pivothaving a projection on its outer end and said element having a slotcoacting with said projection to lock the pivot and element together.

3. A device comprising a scale pivot structure including a linearbearing portion for engaging a similar bearing portion, a coacting scalepivot, said structure also including a part having a round portionprovided with a concentric concave groove, a scale member having a roundopening rotatively adjustably receiving said round portion and providedwith a circular bore having a threaded portion, the bore extendingangularly to said opening and said groove, a pair of round elementslocated in said bore and rotatably engaging the opposite walls thereofand the adjacent portions of the groove, and a screw threaded into thebore and having a wedge end for spreading the round elements aparttowardsopposite walls of said base into locking engagement with thewalls of the bore and for simultaneously moving them towards the grooveto lock against and thereby prevent relative longitudinal and rotativemovement of the scale member and the pivot structure.

4. A device comprising a pivot element,,a scale ;member having anopening for rotatably receiving the element, a device adapted to bemounted on the outside of said member'after' the pivot element is inplace, said element having a noncircular portion extending outside themember,

the device having a non-circular portion interlocking with the similarportion of the element,

and means for adjusting the device to rotatably shift the pivot relativeto the member.

5. A device comprising a pivot, a member for rotatably supporting saidpivot, a rigid device carried by said member and having anextensiondisposed transversely to the pivot axis and provided withmeans forengaging the pivot, a bear ing element mounted on said pivot, the devicehaving another extension angular to the pivot axis for 'engagingone'endof said bearing element to serve as an end thrust plate, and means forsecuring theJdevice tothe member against removal, thesecuring meansbeing adapted to adjust the device'for rotatably shifting the pivotrelative to the member.

'6. A device comprising a pivot, a scale member having an opening forrotatably receiving the pivot,- the'pivot having a non-circular'portionextending outside the scale member, a bearing element supported by thepivot, and a U-shaped plate'straddli'ng the scale member having one legprovided with'a' non-circular portion for receiving the-similar portionof sa'id'pivot, the other leg of said plate serving as a thrust plate tore-' 'sistend thrust of the bearing element, and screws,

for-securing the base of the U-shaped plate to the scale member andadapted toadjust the U;

' :te'nding'laterally and en my of the lever arm. for rockingcooperation-with a v -be'aringblock and having atthe side thereofaround'trunnion rotatively adjustably seated in said hole, rotativeshaped plate toro'tatively shift; the'pivot relative 'tothem'embe'r. J

'7. Ina scale, a lever :havingan arm provided a with around hole andangularly thereto a bore communicating with the hole, a knifeedgeexadjustment of the trunnion moving the knife edge angularly to varyits moment arm on the with the wall of the bore and the aforesaidtrunnion surface to thereby fix the knife edge against rotation relativeto the lever and correspondingly fix the moment arm ofthe knife edge. 7

8; In a scale, a lever having an arm provided with a round hole andangularly thereto a bore communicating with the hole, a knife edgeextending laterally and exteriorly of the lever arm for rockingcooperation with a V-bearing block and having at the side thereof around trunnion rotatively adjustably seated in said hole, rotativeadjustment of the trunnion moving the knife edge angularly to vary itsmoment arm on the lever, a member adjustable along said bore andhaving awedge end facing the trunnion, and a round-element rotatably interposedbetween the wedge end, the wall of the bore, and the trunnion surfaceclosing the inner end of the bore and upon adjustment of the memberalong said bore forced by the wedge end towards and intowedgingengagement with the wall of the bore and the aforesaid trunnionsurface to thereby fix the knife edge against rotationrelative to thelever and correspondingly fix theimoment arm of the knife edge.

9. In a scale, a lever provided with a round hole and angularly theretoa threaded bore communicating at itsinner end with said hole, a knifeedge extending laterally and exteriorlyof the lever side 7 for rockingengagement with a coacting V-bearing and interposed between the wedgeend, the Wall of the'bore, and the surface of the trunnion closing thebore and upon adjustment of the screw forced apart bythe wedge endtowards and into wedging 'co'ac'tion with the walls of the bore andtheaforesaid trunnion surface to thereby fix the knifeedge againstrotation relativeyto the lever and to cor-- respondingly fix the momentarm of the knife edge. i.

10. In a scale, a lever having a round hole-and angularly thereto a borecommunicating with the hole, a knife edge extending laterally and exteriorly of the lever side for rocking cooperation with a coactingV-bearing and havingat-the side thereof a rojundv trunnion rotativelyadjustably seated in'said hole, said trunnion having aperipheral groove,a member adjustable along said bore and provided with a wedgeend facingthe trunnion groove, and around element rotatably I interposed betweenthe sides of'the trunnion groove,',the wall of the bore, and'the wedgeend and upon adjustmentof said member along the bore forced by the wedgeend towardsan-d into wedging locking engagement with'the wall of thebore and the sides of the trunnion groove to thereby'iix theknife edgeagainst rotative move ment relative'to the lever and to locate: and fix.the longitudinal position of the knife edge.

'WILLIAM .N. GILBERT.

